All the world’s a scam? Running time: 94 minutes. Not rated (profanity). At Film Forum, Houston and Varick streets.

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BRUSH up on your Shakespeare – “Much Ado About Something” is an entertaining documentary that freshly considers arguments the Bard’s immortal plays were written by somebody else.

Even the head of the Royal Shakespeare Company, Mark Rylance, confesses doubts about Will, who some historians feel lacked the education his plays reflect.

Australian filmmaker Michael Rubbo wades into the debate over whether the canon was actually the work of Shakespeare’s contemporary, Christopher Marlowe.

Shakespeare’s backers say that’s ridiculous, because Marlowe was killed in a fight in 1593, the same year Shakespeare appeared on the scene.

But Rubbo takes up the gauntlet of the late Calvin Hoffman, an eccentric American who devised an elaborate conspiracy theory that held Marlowe faked his death, fled in exile to Italy because he was in trouble with England’s Catholic Church – and used Shakespeare, a businessman, as a playwrighting front.

Hoffman went as far as getting permission to open the coffin of the chief of Queen Elizabeth’s secret service – for whom Marlowe supposedly worked – in the hope he would find Shakespearean manuscripts.

He didn’t, but that hasn’t dissuaded the most ardent of the Marlovians who are heard from in Rubbo’s documentary – including a bookseller whose wife is adamantly in the man from Stratford’s corner.

How come Shakespeare’s plays are still regularly performed while Marlowe’s rarely are revived?

Rubbo offers his own theory: The Shakespeare plays were a collaboration between the exiled Marlowe and junior partner Shakespeare, who provided the low comedy lacking in Marlowe’s credited plays.